WO2006102273A2 - Transducteurs polymeres electroactifs a haut rendement - Google Patents

Transducteurs polymeres electroactifs a haut rendement Download PDF

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Publication number
WO2006102273A2
WO2006102273A2 PCT/US2006/010120 US2006010120W WO2006102273A2 WO 2006102273 A2 WO2006102273 A2 WO 2006102273A2 US 2006010120 W US2006010120 W US 2006010120W WO 2006102273 A2 WO2006102273 A2 WO 2006102273A2
Authority
WO
WIPO (PCT)
Prior art keywords
transducer
epam
frustum
cap
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2006/010120
Other languages
English (en)
Other versions
WO2006102273A3 (fr
Inventor
Jon Heim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Artificial Muscle Inc
Original Assignee
Artificial Muscle Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN2006800089466A priority Critical patent/CN101147271B/zh
Application filed by Artificial Muscle Inc filed Critical Artificial Muscle Inc
Priority to EP06739058.3A priority patent/EP1861885B1/fr
Priority to BRPI0611459-8A priority patent/BRPI0611459A2/pt
Priority to HK08108147.7A priority patent/HK1113019B/xx
Priority to JP2008503080A priority patent/JP5140576B2/ja
Priority to KR1020077024031A priority patent/KR101326339B1/ko
Priority to CA002602542A priority patent/CA2602542A1/fr
Priority to AU2006227189A priority patent/AU2006227189B2/en
Publication of WO2006102273A2 publication Critical patent/WO2006102273A2/fr
Publication of WO2006102273A3 publication Critical patent/WO2006102273A3/fr
Priority to IL186033A priority patent/IL186033A/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/02—Loudspeakers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009—Special features
    • F04B43/0054—Special features particularities of the flexible members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/04—Pumps having electric drive
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/009—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras having zoom function
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
    • G02B7/102—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens controlled by a microcomputer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators
    • H10N30/206—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators using only longitudinal or thickness displacement, e.g. d33 or d31 type devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S310/00—Electrical generator or motor structure
    • Y10S310/80—Piezoelectric polymers, e.g. PVDF

Definitions

  • the present invention relates generally to electroactive polymer constructions that convert electrical energy to mechanical energy and vice versa. More particularly, the present invention relates to frame and web configurations for pre-strained polymer actuators and transducers.
  • Electroactive Polymer Artificial Muscle (EPAM TM) technology developed by SRI International and licensee Artificial Muscle, Inc., excels in each of these categories relative to other available technologies. In many applications, EPAM TM technology offers an ideal replacement for piezoelectric, shape-memory alloy (SMA) and electromagnetic devices such as motors and solenoids.
  • SMA shape-memory alloy
  • EPAMTM technology operates by application of a voltage across two thin elastic film electrodes separated by an elastic dielectric polymer.
  • the oppositely-charged members attract each other producing pressure upon the polymer therebetween.
  • the pressure pulls the electrodes together, causing the dielectric polymer film to become thinner (the z-axis component shrinks) as it expands in the planar directions (the x and y axes of the polymer film grow).
  • Another factor drives the thinning and expansion of the polymer film.
  • the like (same) charge distributed across each elastic film electrode causes the conductive particles embedded within the film to repel one another expanding the elastic electrodes and dielectric attached polymer film.
  • Artificial Muscle, Inc. is developing a family of new solid-state devices for use in a wide variety of industrial, medical, consumer, and electronics applications.
  • Current product architectures include: actuators, motors, transducers/sensors, pumps, and generators. Actuators are enabled by the action discussed above. Generators and sensors are enabled by virtue of changing capacitance upon physical deformation of the material.
  • Artificial Muscle, Inc. has introduced a number of fundamental "turnkey" type devices can be used as building blocks to replace existing devices. Each of the devices employs a support or frame structure to pre-strain the dielectric polymer. It has been observed that the pre-strain improves the dielectric strength of the polymer, thereby offering improvement for conversion between electrical and mechanical energy by allowing higher field potentials.
  • "Spring Roll” type linear actuators are prepared by wrapping layers of EPAMTM material around a helical spring.
  • the EPAMTM material is connected to caps/covers at the ends of the spring to secure its position.
  • the body of the spring supports a radial or circumferential pre-strain on the EPAMTM while lengthwise compression of the spring offers axial pre-strain. Voltage applied causes the film to squeeze down in thickness and relax lengthwise, allowing the spring (hence, the entire device) to expand.
  • By forming electrodes to create two or more individually addressed sections around the circumference, electrically activating one such section causes the roll extend and the entire structure to bend away from that side.
  • Bending beam actuators are formed by affixing one or more layers of stretched
  • the EPAMTM material along the surface of a beam. As voltage is applied, the EPAMTM material shrinks in thickness and growth in length. The growth in length along one side of the beam causes the beam to bend away from the activated layer(s).
  • Pairs of dielectric elastomer films can be arranged in "push-pull" configurations. Switching voltage from one actuator to another shifts the position of the assembly back and forth. Activating opposite sides of the system makes the assembly rigid at a neutral point. So-configured, the actuators act like the opposing bicep and triceps muscles that control movements of the human arm. Whether the push-pull structure comprises film sections secured to a flat frame or one or more opposing spring rolls, etc, one EPAMTM structure can then be used as the biasing member for the other and vice versa.
  • Another class of devices situates one or more film sections in a closed linkage or spring-hinge frame structure.
  • a biasing spring will generally be employed to pre-strain the EPAMTM film.
  • a spring-hinge structure may inherently include the requisite biasing. In any case, application of voltage will alter the frame or linkage configuration, thereby providing the mechanical output desired.
  • Diaphragm actuators are made by stretching EPAMTM film over an opening in a rigid frame.
  • Known diaphragm actuator examples are biased (i.e., pushed in/out or up/down) directly by a spring, by an intermediate rod or plunger set between a spring and EPAMTM, by resilient foam or air pressure. Biasing insures that the diaphragm will move in the direction of the bias upon electrode activation/thickness contraction rather than simply wrinkling.
  • Diaphragm actuators can displace volume, making them suitable for use as pumps or loudspeakers, etc.
  • EPAMTM technology transducers there continues to be an interest in developing more efficient EPAMTM transducers.
  • the gains in efficiency offered by transducers according to the present invention may come in terms of preloading improvement, interface with driven/driving components, output, manufacturability, etc. Those with skill in the art will appreciate the applicable advantages.
  • the present invention offers a number of EPAMTM transducer designs to augment the line of "turn-key” tools offered by the assignee hereof (Artificial Muscle, Inc.).
  • the designs all share the requirement of a frame or fixture element used in preloading the elastomeric film electrodes and dielectric polymer in a desired configuration.
  • Certain of the embodiments include push-pull subassemblies. Aspects of the invention may incorporate a complex frame structure to marry different types of actuators. Another aspect of the invention includes frame structures with alternative push-pull actuator configurations for in-plane and/or out-of-plane input/output. Still other aspects of the invention are directed toward producing more robust and/or easily manufactured actuator structures.
  • frustum-shaped diaphragm actuators are produced in which the top of the structure includes a cap.
  • the cap may be a solid disc, annular or otherwise constructed. The cap provides a stable interface between opposing frustums and/or for a mechanical preloaded element such as a spring. Also included in the invention are advantageous applications for the subject transducer structures.
  • the pump may use a single-frustum actuator or a double-frustum actuator design.
  • the frustum cap provides a stable surface against which to mechanically bias the structure.
  • Such a structure can be made very robust as well as compact.
  • a double-frustum design requires no additional preload source. Further, it may be configured to serve as a double-acting pump.
  • use of two actuators arranged in series offers the potential to double the stroke. Other in-series actuator arrangements are contemplated in the present invention as well.
  • Another application is for a camera in which lens position is manipulated by a frustum-type actuator. Again, either a single or double-frustum design may be employed. A double frustum approach may be desirable from the perspective of using one of the sides for position sensing and preload, and another for actuation.
  • Another camera application uses the complex frame in which a frustum-type actuator controls lens position and one or more planar actuator sections control zoom.
  • valves or valve control components
  • speaker diaphragms multi-axis position sensors/joysticks
  • vibrators haptic or force feedback control devices
  • multi-axis actuators etc.
  • a "frustum” is technically the portion of a geometric solid that lies between two parallel planes
  • a frustum is often regarded as the basal part of a cone or pyramid formed by cutting off the top by a plane, typically, parallel to the base.
  • frustum-type actuators according to the invention may be in the form of a truncated cone, thereby having a circular cross-section, or may employ a variety of cross- sectional configurations
  • cross-sectional geometries include triangular, square, pentagonal, hexagonal, etc. Often, symmetrically shaped members will be desirable from the perspective of consistent material performance. However, ovaloid, oblong, rectangular or other shapes may prove better for a given application - especially those that are space-constrained. Further variation of the subject "frustum" transducers is contemplated in that the top and/or bottom of the form(s) need not be flat or planer, nor must they be parallel. In a most general sense, the "frustum" shape employed in the present invention may be regarded as a body of volume that is truncated or capped at an end. Often this end is the one having the smaller diameter or cross-sectional area.
  • the various devices describe may be driven by the specific actuators described herein or by others. Yet, all of the devices incorporate a diaphragm in their design.
  • the actuator cap and device diaphragm are one in the same, thereby integrating the subassemblies.
  • FIGs 1 A and 1 B show opposite sides of an EPAMTM layer
  • FIG 2 is an assembly view of an EPAMTM layer stack
  • FIG 3 is an assembly view of an EPAMTM planar actuator
  • FIGs 4A and 4B are assembly and perspective views, respectively, of a planar transducer configuration
  • FIG 5 is a top view of a the device in FIGs 4A and 4B electrically connected for planar actuation;
  • FIGs 6A and 6B are assembly and perspective views, respectively, of the transducer in FIGs 4A and 4B setup in an alternate, frustum configuration for out-of-plane actuation;
  • FIGs 7A-7C diagrammatically illustrate the geometry and operation of frustum-shaped actuators
  • FIG 8 is a top view of a multi-phase frustum-shaped actuator
  • FIG 9A is an assembly view of another frustum shaped actuator
  • FIG 9B is a side view the same basic actuator with an alternate fame construction
  • FIG 10 is a sectional perspective view of a parallel-stacked type of frustum transducer
  • FIG 11 is a side-section view showing an optional output shaft arrangement with a frustum type transducer
  • FIG 12 is a side-section view of an alternate, inverted frustum transducer configuration
  • FIG 13 is a sectional perspective view of a coil spring-biased single frustum transducer
  • FIG 14 is a perspective view of a leaf spring-biased single frustum transducer
  • FIG 15 is a perspective view of a weight-biased single frustum transducer
  • FIG 16 is a perspective view of frustum-type transducers provided in series for stroke amplification
  • FIG 17 is a perspective view of a reconfigurable exploratory system offering transducers of various types, and FIGs 18A-18C are assembly views of various alternative configurations for the system in FIG 17;
  • FIG 19A is a sectional perspective view of a camera lens assembly employing an frustum actuator for control focus
  • FIG 19B is an assembly view of camera components with the system shown in FIG
  • FIG 20 is a sectional perspective view of a camera lens assembly employing another type of frustum actuator for focus control;
  • FIG 21 A is a sectional perspective view of another camera lens assembly employing an actuator combination to control each of zoom and focus
  • FIG 21 B is an assembly view of camera components with the system shown in FIG 21A;
  • FIGs 22A and 22B are perspective views showing an alternative means of controlling zoom
  • FIGs 23A-23C are perspective views showing progressive stages of actuation of the transducer arrangement in FIGs
  • FIGs 24A is an assembly view of a valve mechanism
  • FIGs 24B and 24C are side-sectional views of the valve in FIG 24A illustrating valve actuation
  • FIGs 25 - 27 are side-sectional views of different valve configurations
  • FIG 28 is a side-sectional view of a pressure measurement transducer according to the invention.
  • FIG 29A is a side sectional view of an active check valve
  • FIG 29B is a perspective view of the structure shown in FIG 29A
  • FIGs 3OA and 3OB are side-sectional views of an inline valve set within an application-specific housing
  • FIGs 31A and 31 B are sectional perspective views showing variations of a first pump employing frustum-type actuators;
  • FIGs 32 and 33 are sectional perspective views showing other pump variations employing frustum-type actuators;
  • FIG 34 is a perspective view of an integrated flow control system employing various of the valves and pumps illustrated above;
  • FIG 35 is a perspective assembly view showing a pump housing with integrated check valves formed in conjunction with the pump diaphragm;
  • FIG 36 is a perspective assembly view showing another pump assembly incorporating check valves;
  • FIG 37 is a perspective view of a vibrator element;
  • FIG 38 is a sectional perspective view of a haptic feedback controller; and
  • FIG 39 is a perspective view on a speaker system employing a plurality of frustum and/or double-frustum transducers. Variation of the invention from that shown in the figures is contemplated.
  • FIGs 1A and 1 B show opposite sides of an EPAMTM layer 10.
  • the layer comprises dielectric polymer sandwiched between elastic thin film electrodes.
  • FIG 1A shows the side of the layer patterned with "hot" electrodes 12 and 14. Each electrode is connected to a lead 16.
  • FIG 1B shows the opposite side of layer 10 patterned with a common "ground” electrode 18 connected to a single lead 16.
  • multiple film layers 10 are stacked and held in a stretched state within frame pieces 20.
  • a number of individual EPAMTM layers 10 are advantageously stacked to form a compound layer 10 g . Doing so amplifies the force potential of the system.
  • the number of layers stacked may range from 2 to 10 or more. Generally, it will be desired to stack an even number of layers so that ground electrodes are facing any exposed surfaces to provide maximum safety.
  • the EPAMTM layer or layers may collectively be referred to as EPAMTM "film”.
  • FIG 3 shows one such construction known in the art.
  • individual cartridge sections 22 are secured to a secondary or body frame portion 24.
  • Any film frames and intermediate frame member are joined to provided a combined (i.e., attached with fasteners as shown, bonded together, etc.) frame structure 26.
  • a spacer 28 provides an interface for an input/output rod 30 received by the frame though guide hole 32.
  • the spacer is attached to the film via complementary mounts 34 bonded to or clamped the EPAMTM film with the spacer.
  • FIGs 4A and 4B provide assembly and perspective view of a transducer 40 according to the present invention that can alternatively be configured for planar actuation (as the device is in FIG 3) and out-of-plane actuation.
  • frames 20 carry layers 10/10' with ground electrodes facing outward.
  • FIG 4B shows the assembled device.
  • frame 26 is shown as a complete unit.
  • FIG 5 shows a basic circuit diagram in which A and B sides of the circuit are powered relative to ground to cause back and forth movement of rod 30 along an X-axis relative to frame.
  • transducer 50 assembly may employ a thicker body frame 24'.
  • caps 42 are secured to one another, they produce deeply concave forms 52 facing opposite or away from one another.
  • one of the concave/frustum sides is expanded by applying voltage while the other side is allowed to relax. Such action increases the depth of one cavity 52 while decreasing that of the other.
  • the motion produced is generally perpendicular to a face of the cap.
  • FIGs 7A-7C diagrammatically illustrate the manner in which these concave/convex or frustum shaped actuators function in a simplified two dimensional model.
  • FIG 7A illustrates the derivation of the transducer frustum shape. Whether conical, squared, ovaloid, etc. when viewed from above, from the side a truncated form 60 is provided by modifying existing diaphragm actuator configurations by capping the top (or bottom) of the structure. When under tension, the cap 42 alters the shape the EPAMTM layer/layers 10/10' would take. In the example where a point load stretches the film, the film would assume a conical shape (as indicated by dashed lines define a triangular top 62). However, when capped or altered to form a more rigid top structure, the form is truncated as indicated in solid lines 64 in FIG 7A.
  • the structure fundamentally alters its performance. For one, it distributes stress that would otherwise concentrate at the center of structure 66 around a periphery 68 of the body instead.
  • the cap is affixed to the EPAMTM layers.
  • An adhesive bond may be employed.
  • the constituent pieces may be bonded using any viable technique such as thermal bonding, friction welding, ultrasonic welding, or the constituent pieces may be mechanically locked or clamped together.
  • the capping structure may comprise a portion of the film that is made substantially more rigid through some sort of thermal, mechanical or chemical techniques - such as vulcanizing.
  • the cap section will be sized to produce a perimeter of sufficient length to adequately distribute stress applied to the material.
  • the ratio of size of the cap to the diameter of the frame holding the EPAMTM layers may vary.
  • the size of disc, square, etc. employed for the cap will be larger under higher stress/force application.
  • the relative truncation of the structure is of further importance to reduce volume the aggregate volume or space the transducer occupies in use, for a given amount of pre- stretch to the EPAMTM layers.
  • the cap or diaphragm 42 element may serve as an active component (such as a valve seat, etc. in a given system).
  • EPAMTM material housed by a frame is stretched in a direction perpendicular to the cap (as seen by comparing the EPAM/frame configurations as shown in FIGs 4A/4B and 6A/6B), it produces the truncated form. Otherwise the EPAMTM film remains substantially flat or planar.
  • the attached EPAMTM polymer sides 10/10' of the structure assume an angle.
  • the angle ⁇ the EPAMTM is set at when not activated may range between 15 and about 85 degrees. More typically it will range from about 30 to about 60 degrees.
  • voltage is applied so that the EPAMTM material is compressed and grows in its planar dimensions, it assumes a second angle ⁇ in about the same range plus between about 5 and 15 degrees.
  • Optimum angles may be determined based on application specifications.
  • Single-sided frustum transducers are within the contemplated scope of the present invention as well as double-sided structures.
  • single sided devices employ any of a spring interfacing with the cap (e.g., a coil, a constant force or roll spring, leaf spring, etc.), air or fluid pressure, magnetic attraction, a weight (so that gravity provides preload to the system), or a combination of any of these means or others.
  • FIGs 7B illustrates the basic "double-frustum" architecture 701.
  • opposing layers of EPAMTM material or one side of EPAMTM film and one side of basic elastic polymer are held together under tension along an interface section 72.
  • the interface section often comprises one or more rigid or semi-rigid cap element(s) 42.
  • the combined region of material alone, offers a relatively stiffer or less flexible cap region in the most basic manner to offer a stable interface portion of the transducer.
  • the double-frustum transducer operates as shown in FIG.
  • the non-active side of the device may simply comprise elastic polymer to provide preload/bias (as mentioned above) or EPAMTM material that is connected electrically to sense change in capacitance only or to serve as a generator to recover motion or vibration input in the device in a regenerative capacity.
  • FIG 8 shows a circular EPAMTM cartridge 90 configuration with three (92, 94, 96) independently addressable zones or phases.
  • the sections When configured as an actuator, by differential voltage application, the sections will expand differently causing cap 42 to tilt on an angle.
  • Such a multiphase device can provide multi-directional tilt as well as translation depending on the manner of control.
  • input form a rod or other fastener or attachment to the cap causing angular deflection can be measured by way of material capacitance change.
  • FIG 9A provides an assembly view of a round-frustum transducer 100.
  • the body frame member 24 employed is solid, resembling that used in the combination or convertible type actuator shown in FIGs 4A-6B above.
  • the device shown in FIG 9A is a dedicated diaphragm type actuator (though it may employ a multi-phase structure shown in FIG 8.)
  • An alternative construction for such an actuator is shown in Fig. 9B.
  • the monolithic frame element 24 is replaced by simple frame spacers 24".
  • FIG. 10 shows another construction variation in which the transducer comprises multiple cartridge layers 22 on each side of a double-frustum device 100. Individual caps 42 are ganged or stacked together. To accommodate the increased thickness, multiple frame sections 24 may likewise be stacked upon one another.
  • each cartridge 22 may employ compound EPAMTM layers 10'.
  • Either one or both approaches - together - may be employed to increase the output potential of the subject device.
  • at least one cartridge member in the of the stack may be setup for sensing as opposed to actuation to facilitate active actuator control or operation verification.
  • any type of feedback approach such as a Pl or PID controller may be employed in such a system to control actuator position with very high accuracy and/or precision.
  • FIG 11 is a side-section view showing an optional output shaft arrangement with a frustum type transducer 110.
  • Threaded bosses 112 on either side of the cap pieces provide a means of connection for mechanical output.
  • the bosses may be separate elements attached to the cap(s) or may be formed integral therewith.
  • external threaded shaft may be employed.
  • Such an arrangement may comprise a single shaft running through the cap(s) and secured on either side with a nuts in a typical jam-nut arrangement. Other fastener or connection options are possible as well.
  • FIG 12 is a side-section view of an alternate transducer 120 configuration, in which instead of employing two concave structures facing away from one another, the two concave/frustum sections 122 face towards each other.
  • the preload or bias on the EPAMTM layers to force the film into shape is maintained by a shim or spacer 124 between caps 42.
  • the space comprises an annular body.
  • the caps may too include an opening in this variation of the invention as well as others.
  • the inward-facing variation of the invention in FIG 12 does not require an intermediate frame member 24 between individual cartridge sections 22.
  • the EPAMTM layers on each side of the device can contact one another.
  • this variation of the invention may offer benefits. Further uses of this device configuration are also discussed below.
  • Other biasing approaches for frustum-type actuators are, however, first described.
  • FIG 13 provides a sectional perspective view of a coil spring- biased single frustum transducer 130.
  • a coil spring 132 interposed between cap 42 and a baffle wall 134 associated with the frame (or part of the frame itself) biases the EPAMTM structure.
  • a leaf spring 142 biases the cap portion of a transducer.
  • the leaf spring is shown attached to a boss 144 by a bolt 146 or a spacer captured between the bold and a nut (not shown) on the other side of the cap. The ends of the leaf are guided by rails 148.
  • the EPAMTM film may be biased by a simple weight 152 attached to or formed integral with the cap(s) 42. Though the device is shown tilted up for the sake of viewing, it will typically be run flat so that the pull of gravity on the weight symmetrical biases the transducer along a Z-axis.
  • any number of parameters of the subject transducers can be varied to suit a given application.
  • a non-exhaustive list includes: the output fastener or connection means associated with the cap (be it a threaded boss, spacer, shaft, ring, disc, etc.); prestrain on the EPAMTM film (magnitude, angle or direction, etc.); film type (silicone, acrylic, polyurethane, etc.); film thickness; active vs. non-active layers; number of layers; number of film cartridges; number of phases; number of device "sides" and direction of device sides.
  • any of the subject transducers can be employed in more complex assemblies.
  • FIG 16 provides a transducer example 160 in which a number of frustum-type transducer subunits 100 are stacked in series for stroke amplification.
  • an inward facing double-frustum transducers 120 offers a second output phase through attachment to its frame 20. While the height of this member is stable due to its internal space (referenced above), the position of its frame is mobile to provide second stage output or input.
  • a simple spacer may be employed between the outer transducers 100 for basic stroke amplification purposes.
  • another such stack may be set on the first, etc.
  • another inward-facing transducer may be employed, etc.
  • Yet another variation contemplates pairing an inward facing transducer with an outward facing transducer in actuator sensor pairs. Naturally, other combinations are within the scope of the present invention.
  • FIG. 18A - 18C provide assembly views of various alternative configurations for the system in FIG 17.
  • a component stack arrangement 172 as shown in FIG 18A
  • system 170 is adapted to serve as a planar actuator.
  • a component stack arrangement 174 as shown in FIG 18B
  • system 170 is adapted to serve as a diaphragm actuator.
  • a component stack arrangement 176 as shown in FIG 18C
  • system 176 is adapted to operate as a diaphragm pump.
  • a pump is described in further detail below.
  • system 170 suffice it to say, here, that the subject architecture lends itself to tremendous flexibility.
  • FIG 19A provides a view of another application employing the present invention.
  • the figure details a camera lens assembly 180 employing a frustum-type actuator 182 to control focus.
  • the cap or diaphragm of the transducer 184 is open in the shape of a ring for light to pass to a lens 186 the may be set in a housing 188.
  • a leaf spring 190 is shown in contact with the housing to bias the EPAMTM film.
  • a completed camera assembly will include at least a shroud or cover 192 , internal frame component(s) 194, a CCD 196 (Charge-Couple Device) for image capture and electronics 198.
  • the electronics may be integrated to drive the entire device, or the electronics on board 200 may simply provide the voltage step-up and control required for the EPAMTM actuator.
  • Suitable power supply modules for such use include EMCO High Voltage Corp.
  • FIG 20 shows another camera lens assembly 226.
  • this design employs a double-frustum type actuator 100 in which the preload side of the device 228 may not be EPAMTM film, but simply an elastomeric web. Should side/layer 228 comprise EPAMTM material, however, it may most advantageously employed for sensing position by capacitance change.
  • FIG 21 A shows a camera lens assembly
  • the device includes a focus stage driven by a diaphragm actuator 214 according to the present invention.
  • the device includes a zoom stage set of planar actuators 216.
  • focus adjustment requires between 0.1 and 2.0 mm movement; zoom often requires 5 to 10 times that amount of stroke.
  • zoom is handled by a different type of actuator.
  • zoom function is actuated by a pair of planar-type transducers 216 located across from one another.
  • each of the planar and diaphragm actuators are formed by EPAMTM film stretched over or upon a common frame element 218.
  • Such functionality is offered by the two-lens arrangement shown.
  • Zoom is accomplished varying the distance between lens 186 and lens 220. Bulk movement of lens 220 relative to lens 186 is accomplished by arms 222 connected to zoom lens frame 224.
  • a combined-use frame offers another option according to the invention that may be applied in any circumstance where bulk movement and fine tuning is required, or where (as in a camera) separate motion components are desired. Though not shown, it also is contemplated that multiple faces of a combined frame may carry diaphragm actuators alone or planar actuators alone. Still further, non-orthogonal frame geometry may be employed.
  • the aforementioned systems can be made extremely compact. As such, they are particularly suitable for use in compact digital or cell phone cameras, etc.
  • FIGs 22A and 22B are perspective views showing an alternative planar camera system 230 in which a telescopic arrangement 232 of planar actuators is provided for controlling zoom. These figures show minimum and maximum zoom positions as indicated by arrows 232 and 234, respectively.
  • FIGs 23A-23C showing stages of the transducer stack actuation.
  • the progressive motion is achieve by connection of successive output bars 238 (partially hidden) to frame sections 20 with the final output bar 340 and attached rod 30 left to float or, rather, to drive zoom components.
  • the present invention further comprises a number of flow control means.
  • valves These means include valves, mixers and pumps.
  • FIG 24A is an assembly view of a valve mechanism.
  • Valve 240 comprises the elements the make up a double-frustum type actuator 100 as discussed above. Namely, valve comprises EPAMTM film stretched within frame members, and secured by cap(s).
  • valve 240 includes a cover 242 with fittings 244, 246 received therein.
  • FIGs 24B and 24C are side-sectional views of the valve in FIG 24A illustrating valve actuation.
  • the valve In FIG 24B the valve is closed. Cap/caps 42 serve as a diaphragm blocking the operative fitting 244 in an "normally closed” configuration in a neutral film (powered or unpowered) condition.
  • the valve In FIG 24C, the valve is opened by actuating the transducer to drive cap 42 in the direction of arrow 248 to allow flow through a chamber 250 formed within the device.
  • FIG 25 shows another one-sided double-frustum diaphragm valve 260.
  • the device differs only in that a tapered needle valve arrangement 262 is provided in order to offer a wider range of control.
  • FIG 26 shows a three-way mixing valve 270.
  • Inlet fittings 272 are connected to lines (not shown) in fluid communication with to different fluid/gas sources (not shown).
  • Exit fittings 274, 276 are connected to a common outlet line (not shown).
  • the position of the cap/diaphragm 42 which may vary as indicated by double arrow 278 dictates the proportion of each different flow able to enter the exits fittings.
  • this device may also include tapered needle valves like the preceding device as may the other described herein.
  • FIG 27 shows an in-line valve 280.
  • diaphragm 282 in this case includes through holes 284. In this manner, fluid is able to pass from one side of the device to the other through fittings 286, 288, where diaphragm 282 modulates the amount of flow able to pass by or into the operative fitting 288.
  • FIG 28 is a side-sectional view of a pressure measurement transducer 290 according to the invention. Fluid pressure entering a chamber 292 is sensed by correlation to changes in capacitance caused by stretching the EPAMTM film. As compared to a typical EPAMTM diaphragm transducer, cap 42 offers a new level of robustness to the system.
  • FIGs 29A and 29B illustrate a variable "cracking pressure" check valve 294.
  • the EPAMTM material of actuator 296 is stretched so that cap seats at the distal end of valve stem 244 with some pressure. When voltage is applied to the material, it contracts in thickness, and extends in the direction of arrow 298, thus reducing the preload at the valve interface. When so-relaxed, fluid at a relatively lower pressure is able to escape past cap 42 (or an valve needle, etc.) exit through fitting 246.
  • FIGs 3OA and 3OB offer views of inline valve configuration 300 in which the frustum-type valve 302 is set within an application-specific housing 304.
  • the housing is configured to replace a vapor canister purge valve used in internal combustion engine applications.
  • FIG 3OA shows the valve in a closed configuration
  • FIG 3OB shows the valve in an open configuration.
  • the valve is normally closed, and open upon voltage application to the EPAMTM film.
  • the valve includes a stem 306 integrated with cap or diaphragm 308.
  • a coil spring 310 is employed in a single-sided design.
  • the pumps may be utilized for fluid or gas transfer under pressure, or used to generate vacuum.
  • Valve structures may be fit to the pump bodies or integrated therein/therewith.
  • FIGs 31 A and 31 B show variations of a first pump 320 and 320" employing double frustum-type actuators 100.
  • Each device comprises a single chamber 322 diaphragm pump.
  • the EPAMTM actuator section may be setup for single or two-phase actuation as discussed above in connection with the various double-frustum transducer designs.
  • the pump includes a pair of passive check valves 324, 326 in which movement of a membrane 328 urged by fluid (including gas) pressure alternatively opens and closes the valves as readily apparent.
  • Pump 320' in FIG 31 B is identical to that in FIG 31 A except that it includes a diaphragm wall 330 in addition to the cap/diaphragm 42 portion.
  • Wall 330 provides an overall improved chamber wall interface (e.g., one the is less susceptible to elastic deformation, offering better material compatibility with caustic chemicals, etc.) than the EPAMTM film itself as employed in the previous pump variation.
  • pump 340 shown in FIG 32 employs passive check valves 324, 326. It differs from the devices, however, in that it embodies an integrated double chamber 342, 344 or double-acting pump.
  • the actuator may be a one- phase or two-phase type transducer.
  • FIG 33 shows a one chamber pump 350. Of course it could be reconfigured into a two-chamber design as in pump 340 in FIG 32. Of interest, however, is that the check valves employed in this device are not passive, but rather EPAMTM valves 352, 354 similar to or as described above in connection with FIG 28. Naturally, other EPAMTM valve configurations may be utilized (e.g., the arrangement shown in FIGs 24A - 24C).
  • FIG 33 offers one illustration of the assembly of various fluid flow subcomponents to create an integrated EPAMTM controlled device offering numerous advantages over known systems.
  • FIG 34 illustrates how the subject devices may be combined with themselves or other devices according to the present invention to offer a system of even greater utility.
  • a "complete" fluid handling system 360 as illustrated in FIG 34 comprises a pump 350, flow control valve 280 and/or a pressure sensor 290.
  • pump 350 a pump 350
  • flow control valve 280 and/or a pressure sensor 290.
  • tubing as appropriate - perhaps as indicated by arrows 362.
  • One potential application of such a system may be in filling or controlling the fill level of a bladder or reservoir (not shown) as a lumbar support in an automobile seat.
  • pump chambers may be connected in series to increase pressure levels attained in pumping, or connected in parallel to increase pumping volume.
  • An array of pumps may, likewise, be provided in using a combination of such connectivity.
  • FIG 35 provides an example of a pump 400 in which flow conduits 402 are integrated in the device structure.
  • EPAMTM 10/10' film stretches to form each of the frustum/truncated diaphragm sections 60 and portions of check valves 404.
  • Discs 406 are attached to the film and are preloaded against valve seats 408 by the tension in the film. Fluid flows through the centers of the discs when they lift off their seats. The discs 406 are bonded to the film, one on each side of the film.
  • Such a structure is highly advantageous from the perspective of using the same film to define both the pump and actuator in single flow system. Still further, by offsetting the valve structure to the side of the transducer body, the overall structure is minimized in thickness. This form-factor may be desired in certain applications where "thinner" designs are desired.
  • FIG 36 shows yet another example of a pump 410.
  • check valves 412 are formed in a side plate assembly 414 of a pump housing.
  • Such a design offers a modular and compact approach for applying the basic transducer architecture in a pump application. Furthermore, this design offers potential for a smaller "footprint" as compared the design in FIG 35. While a second side plate 416 may simply be provided to complete the assembly two check-valve type plates may instead be used to provide a double-acting pump similar in concept to that shown in FIG 32.
  • FIG 37 shows a vibrator type device 370.
  • a mass element is provided to generate vibration or not
  • FIG 38 shows a haptic feedback controller 380.
  • the controller may be a game console device with a "joy stick" 382 that transmits vibration generator for tactile or force feedback to a user.
  • the joystick is attached to a multi-phase transducer 384 that by virtue of capacitance change upon deformation is able to sense or signal user manipulation in the user input or control means.
  • Such a device would have applications ranging from game console construction to providing a surgeon a highly accurate interface to facilitate robotic surgery.
  • FIG 39 illustrates a variation of the present invention in which a speaker system 390 is provided that employs a plurality of frustum and/or double-frustum transducers 392, 394, 396.
  • a "tweeter” driver 392 is smallest, followed by a larger “mid-range” driver 394 and finally by a large “woofer” driver 396.
  • both large and small (low and high frequency tuned) speaker can be produced. They can be driven at high power and still offer a light-weigh high performance speaker because no hefty magnets or coils are required as in typical electromagnetic speakers.
  • the low profile of the transducers lend themselves to variation in speaker cabinet 398 design to offer uncompromised options in styling to the audiophile.
  • Methods associated with the subject devices are contemplated in which those methods are carried out with EPAMTM actuators.
  • the methods may be performed using the subject devices or by other means.
  • the methods may all comprise the act of providing a suitable transducer device.
  • Such provision may be performed by the end user.
  • the 'providing e.g., a pump
  • the end user merely requires the end user obtain, access, approach, position, set-up, activate, power-up or otherwise act to provide the requisite device in the subject method.
  • kits having any combination of devices described herein - whether provided in packaged combination or assembled by a technician for operating use, instructions for use, etc.
  • a kit may include any number of transducers according to the present invention.
  • a kit may include various other components for use with the transducers including mechanical or electrical connectors, power supplies, etc.
  • the subject kits may also include written instructions for use of the devices or their assembly.
  • kit Instructions of a kit may be printed on a substrate, such as paper or plastic, etc.
  • the instructions may be present in the kits as a package insert, in the labeling of the container of the kit or components thereof (i.e., associated with the packaging or sub-packaging) etc.
  • the instructions are present as an electronic storage data file present on a suitable computer readable storage medium, e.g., CD-ROM, diskette, etc.
  • the actual instructions are not present in the kit, but means for obtaining the instructions from a remote source, e.g. via the Internet, are provided.
  • An example of this embodiment is a kit that includes a web address where the instructions can be viewed and/or from which the instructions can be downloaded. As with the instructions, this means for obtaining the instructions is recorded on suitable media.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating Pumps (AREA)
  • Micromachines (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne des constructions polymères électroactifs qui convertissent l'énergie électrique en énergie mécanique et vice versa. Les transducteurs selon l'invention (actionneurs, générateurs, capteurs ou combinaisons de ces derniers) nécessitent un châssis ou un bâti en vue de précharger des électrodes de film élastomère et un polymère diélectrique dans une configuration voulue. Les structures sont soit entièrement sollicitées, soit placées dans une configuration de type push-pull, soit préchargées/sollicitées par un autre élément.
PCT/US2006/010120 2005-03-21 2006-03-21 Transducteurs polymeres electroactifs a haut rendement Ceased WO2006102273A2 (fr)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AU2006227189A AU2006227189B2 (en) 2005-03-21 2006-03-21 High-performance electroactive polymer transducers
EP06739058.3A EP1861885B1 (fr) 2005-03-21 2006-03-21 Transducteurs polymeres electroactifs a haut rendement
BRPI0611459-8A BRPI0611459A2 (pt) 2005-03-21 2006-03-21 dispositivo e conjunto de diafragmas
HK08108147.7A HK1113019B (en) 2005-03-21 2006-03-21 Electroactive polymer transducers
JP2008503080A JP5140576B2 (ja) 2005-03-21 2006-03-21 高性能電気活性ポリマトランスデューサ
CN2006800089466A CN101147271B (zh) 2005-03-21 2006-03-21 电活性聚合物换能器
CA002602542A CA2602542A1 (fr) 2005-03-21 2006-03-21 Transducteurs polymeres electroactifs a haut rendement
KR1020077024031A KR101326339B1 (ko) 2005-03-21 2006-03-21 고성능 전기활성 고분자 변환기
IL186033A IL186033A (en) 2005-03-21 2007-09-18 High-performance electroactive polymer transducers

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/085,804 US7521840B2 (en) 2005-03-21 2005-03-21 High-performance electroactive polymer transducers
US11/085,804 2005-03-21

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WO2006102273A2 true WO2006102273A2 (fr) 2006-09-28
WO2006102273A3 WO2006102273A3 (fr) 2007-06-21

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US (2) US7521840B2 (fr)
EP (1) EP1861885B1 (fr)
JP (1) JP5140576B2 (fr)
KR (1) KR101326339B1 (fr)
CN (2) CN101147271B (fr)
AU (1) AU2006227189B2 (fr)
BR (1) BRPI0611459A2 (fr)
CA (1) CA2602542A1 (fr)
IL (1) IL186033A (fr)
RU (1) RU2007138344A (fr)
WO (1) WO2006102273A2 (fr)

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US7923902B2 (en) 2011-04-12
CA2602542A1 (fr) 2006-09-28
WO2006102273A3 (fr) 2007-06-21
AU2006227189B2 (en) 2011-07-07
CN102088652A (zh) 2011-06-08
IL186033A0 (en) 2008-02-09
BRPI0611459A2 (pt) 2010-09-08
US20090174293A1 (en) 2009-07-09
JP2008533973A (ja) 2008-08-21
RU2007138344A (ru) 2009-04-27
KR20080003817A (ko) 2008-01-08
US20060208610A1 (en) 2006-09-21
KR101326339B1 (ko) 2013-11-11
JP5140576B2 (ja) 2013-02-06
EP1861885B1 (fr) 2016-05-11
CN101147271A (zh) 2008-03-19
US7521840B2 (en) 2009-04-21
HK1113019A1 (en) 2008-09-19
IL186033A (en) 2012-03-29
CN102088652B (zh) 2013-05-15
AU2006227189A1 (en) 2006-09-28
EP1861885A4 (fr) 2012-06-27
EP1861885A2 (fr) 2007-12-05
CN101147271B (zh) 2010-11-10

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